from collections import defaultdict


k = int(input())
l = [2, 3, 5, 7, 11, 13]
l2 = [4, 6, 8, 9, 10, 12]
d = defaultdict(int)
for i in range(6):
    for j in range(6):
        d[l[i] * l2[j]] += 1
print(d[k] / 36)